Double point drafting device



C. R. HOWARD DOUBLE POINT DRAFTING DEVICE Feb- 5,

Filed 001:. 24, 1944 2 Sheets-Sheet l I GZZHaw-anZ Feb. 5, 1946. c. R. HOWARD DOUBLE POINT DRAFTING DEVICE Filed Ogt. 24, 1944 2 Sheets-Sheet 2 .5. Y 045.1 ldrin/1K9.

afalz ow'arcz Patented Feb. 5, 1946 UNITED STATES PATENT- OFFICE DOUBLE POINT DRAFTING DEVICE Charles E. Howard, Greenbelt, Md.

Application October 24, 1944, Serial No. 560,152

Claims.

This invention relates to ruling pens and more particularly to double line ruling pens.

An object of this invention is to provide an improved double line pen structure embodying the use of conventional pen points which are secured to a holder swivelly carried by a movable support.

Another object of this invention is to provide an improved double line pen structure wherein the space between the two pens can be readily varied to form double lines of selected distance apart.

A further object of this invention is to provide an improved pen holder for a pen structure of this kind embodying an improved three-point support which is readily adjustable as to height, the support also' including a base which has a degree of flexibility so that the pens may be maintained in contact with the paper, the holder also being cushioned with respect to the support so as to cushion the pressure exerted on the support.

To the foregoing objects, and others which may hereinafter more fully appear, the invention consists of the novel construction, combination and arrangement of parts, as will be more specifically referred to and illustrated in the accompanying drawings, but it is to be understood that changes, variations, and modifications may be resorted to which fall within the scope of the invention as claimed.

In the drawings:

Figure 1 is a perspective View of a drawing instrument constructed according to an embodiment of this invention.

Figure 2 is a detail side elevation partly in section of the inking structure.

Figure 3 is a sectional View taken on the line 33 of Figure 2.

Figure 4 is a detail side elevation of the pen assembly on the side opposite from Figure 2.

Figure 5 is a sectional view taken on the'line 5-5 of Figure 3 or 4.

Figure 6 is a sectional View taken on the line 6-5 of Figure 3 or 4.

Figure 7 is a fragmentary side elevation of a modified form of this invention.

Figure 8 is a sectional view taken on the line 8-4! of Figure '7.

Referring to the drawings, the numeral l0 designates generally a plate constituting a base which is preferably of transparent material and is formed of a body ll having a rounded extension l2 at its forward end and a V-shaped cutspaced apart'rear arms l4 and IS. The plate 10 has secured to and extending downwardly therefrom three supporting legs I6, I1 and I8.

The supporting legs are of like construction and each includes a downwardly extending body l9,

which is secured to the body II by means of a nut 21). The body 19 is formed with a longitudinal bore in which an extensible leg 2| slidably engages. The extensible leg 2| is provided in the periphery thereof with a longitudinal channel 22 within which a setscrew 23, threaded through the body I9, is adapted to engage for holding the extensible leg 2| in adjusted position. Each leg 2| at the lower end thereof has rotatably mounted therein a ball 24 for facilitating the movement of the device over the surface of the paper.

A ruling pen structure generally designated as 25 is swivelly carried by the extension l2. The pen 25 includes a body 26 formed with an upper part 21, an intermediate part 28 extending down- I position material, is held stationary with respect to the extension I2 and the plate ill, by means of a set screw 35 which is threaded through a nut member 36 disposed on the upper side of extension l2. A clamping member 31 is threaded into the nut member 36 from the lower side of extension l2, engaging through an opening 38 formed in the extension l2.

The clamping member 31 is formed with a flange 39 hearing against the lower side of extension I2 and preferably the flange 39 is formed with oppositely disposed flat portions 40 by means of which a tool may be engaged with the clamping member 37, was to tightly secure the nut or shaft supporting member 36 with respect to extension l2.

The upper end of shaft 30 is threaded as at 4| and a nut 42 is threaded on to the upper end of shaft 30 and provides a means whereby spring 34 may be tensioned to the desired degree.

A lower body portion 29 is provided with a lonout l3 at its rear end, thereby forming a pair of gitudinally extending concave pen seat 43 within which the convex side of a pen 44 is adapted to engage. The pen 44 is clamped on seat 43 by means of a transversely arcuate clamping plate 45, which is formed with a base 46 secured by means of a fastening member 41 to intermediate body 28. The body portion. 29, as shown in Figure 3, is a tapered construction with the small end lowermost and seat 43 is also inclined so that pen point 44 will be inclined to the vertical. A second pen holder structure generally designated as 48 is pivotally carried by a pivot 48 extending through the upper body portion 21. Body portion 21 is formed with an elongated slot 58 within which a reduced upper end portion-52 of the holder 48 is adapted to rockably engage.

The pen holder structure 48 also includes a lower body 53 which is formed with a concave pen point seat 54 on which a pen point .55 is adapted to engage. The pen point 55 is tightly clamped on seat 54 by means of a clamping plate 56, havin a base 51 secured by means o a faseninememb or c w 5 t e nterm ate portion of the holder 48 In order to provide a means whereby pen point 55 may be adjusted with respect to pen point 44,

pen points may be adjusted relative to each other by the adjusting screw 58 and the points may then be inked in any suitable mannerv whereupon the balls 24 of the legs 2| are engaged with the surface of the paper. The points 44'and 55 will make a pair of spaced apart lines 1.4 and 75,.respectively, on the surface of the paper, and vdue to the rotatable mounting of the I have provided an adjusting screw 59 which is threaded through the pen structure 48 and engages the intermediate body 28. Pen structure 48 is yieldably held in adjustable position by means of an elongated resilient bar 60 pivotally mounted on a pivot 6| engaging through a pair of ears 62 carried by body 28. The elongated resilient barfifl engages in an elongated slot 63 formed in the upper body portion 21 and resiliently bears against theadjacent portion of the extension 52 of holder 48. The resilient, bar 66 is bent longitudinally, as shown in Figure 3, having an out wardly offset'lower portion 64 through which a threaded adjusting screw 65 engages. The adjusting screw 65 is adapted to-bear against the concave side of clamping member 45, so that adjustment of screw 65 will provide the desired tension on the upwardly extending part 52 of holder 48. The body portion 28 on the side thereof confronting pen point 55 is formed with a concave seat 66 within which pen point 55 is adapted to engage when the two pen points are at their in-- nermost or closest positions.

In order to provide a means whereby the pen structure may be formed into a fountain pen, I have provided a well 61, which is formed transversely through the lower body'portion 29 and which is adapted to receive ink for engagement with either one or both of the points 44 and 55 Referring. now to Figures 7 and 8, there is dis.- closed a modified form of pen structure wherein either one or two pen points may be used with the points non-adjustable as to their space apart. A pen holder body 68 is fixed within a bore 69 formed in a threaded member 10 which is adapted to engage through the extension l2, and is threaded into the lower end of nut member '36. The holder 68 is formed with a pair ofpen point sockets "H and 12 for receiving one or more points 13. The points in the socket H and 12 are not adjustable relative to each other, whereas the structure embodied in Figures 1 to 6, inclusive,

holder 25 the frictional contact of the points 44 and with the paper. i suchthat-th two spaced lines 14 and 15 can bemade onany desired curvamm or in. a tr ht lin the ho d r 25swive11ine in the mounting therefor as base 18 is moved about the paper surface. Due to the transparency of base ID, the user of this device can readily view the paper which is being inked,

through the base, so that the spaced lines 14 and 15 can be made on the paper at the proper I positions. This device may be used for map making where double lines are used to indicate roads and for other purposes for which two evenly spaced lines one. sheet of paper are desirable.

WhatI claim is: 7

d ft n n trume t comprisin aplat a plurality of supporting legs carried by said plate, a pen holder, means swivelly mounting said pen holder on said plate and aresilient cushioning member correlated with said mounting means.

2.-*A drafting instrument comprising a'plate,

aplurality of supporting legs for said plate, and

3. A drafting instrument as set forth'in claim 2- wherein said plate is formed of substantially resilient transparent'material.

41A drafting instrument as set forthin claim 2 including tensionable means constantly ur ing said one holder toward the other holder.

5. A drafting instrument comprising a relatively flexible plate, a plurality of supporting legs carried by said plate, a pen holder depending from said plate, and means pivotally securing said pen holder to said plate.

; CHARLES R. HOWARD. 

